Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7796c3b963300fa…

MALICIOUS

PDF

58.0 KB Created: 2020-08-20 18:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 254a799e52801c9b544860f62f0154e4 SHA-1: 5e4608b49c915d29e41a3437fdb70e722da7cf14 SHA-256: e7796c3b963300fa30cf05e32fa251bac9a6a2852781ae33c41d136143065dfb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm and a direct link to a redirector, indicating a phishing or scam attempt. The document body, though heavily obfuscated, contains text related to 'fun platformer games unblocked' and the malicious URL. The ML classifier strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=fun+platformer+games+unblocked
    • http://xebezimif.chineseproverbs.net/uploads/1/3/2/7/132740249/443a42d2240.pdf
    • http://jinuwe.petalumaffa.com/uploads/1/3/1/8/131856772/modefagu-zotewukuba.pdf
    • http://ruwezis.northcountryquiltersvt.com/uploads/1/3/1/4/131407164/sovej.pdf
    • http://ruwezis.northcountryquiltersvt.com/uploads/1/3/1/4/131407164/sovej
    • https://cdn.shopify.com/s/files/1/0430/9336/0801/files/ct_abdomen_anatomy.pdf
    • https://cdn.shopify.com/s/files/1/0429/2929/1427/files/saxazidop.pdf
    • https://cdn.shopify.com/s/files/1/0432/8049/8841/files/mijagirabin.pdf
    • https://cdn.shopify.com/s/files/1/0431/1629/8393/files/public_finance_management_act_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/2273/6798/files/59648267786.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5080/files/7128076932.pdf
    • https://cdn.shopify.com/s/files/1/0434/6334/4280/files/music_festival_brochure.pdf
    • https://cdn.shopify.com/s/files/1/0432/9085/3541/files/castor_informatique_entrainement_2015.pdf
    • https://cdn.shopify.com/s/files/1/0432/4311/0564/files/22503833125.pdf
    • https://cdn.shopify.com/s/files/1/0448/1551/5805/files/address_proof_letter_format_in_english.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068ca.bin
4e1a9c4cb32f1bc4ff176ae4dc1460c31b2d267bf2def0252f23ad2731e7be72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68CA 6588 bytes
font_01_sfnt_off00007912.bin
f77da3cffd621606da7cf00a8a6e5aa952d0afff1fc29e44ba797ccf2d580518		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7912 3488 bytes
font_02_sfnt_off00008541.bin
02085523456b0c777ab5396fea1eb14901112a76e3a231944fdc1da800d5708a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8541 5636 bytes
font_03_sfnt_off00009855.bin
ce47816c6c95827a7613d95b2d7622bd3763386d14aaf620df33240998265b68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9855 12104 bytes
font_04_sfnt_off0000c19c.bin
aaba42b5a444fafea398f05ddfd69d66324e816d71da38708850cd5324154462		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC19C 17040 bytes

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